error: conversion from ‘std::vector＜int＞::const_iterator {aka __gnu_cxx::__normal_iterator＜const int

const vector作为函数形参时，要使用迭代器，必须用const_iterator，否则编译不通过。
报错如下：

error: conversion from ‘std::vector<int>::const_iterator {aka __gnu_cxx::__normal_iterator<const int*, std::vector<int> >}’ to non-scalar type ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ requested
     vector<int>::iterator my = ();

正确写法如下：

void print_vector(const vector<int>& test) {
    vector<int>::const_iterator my = test.begin();
    while(my != test.end()) {
        cout << "my - () = " << my - test.begin() << endl;
        cout << *my++ << "\n"; //先取值再++
    }
    cout << endl;
}